User blog comment:LegionZero/Nero's Parallels to Vergil and Sparda/@comment-112.198.90.108-20140906072714/@comment-216.80.140.168-20141104040831

It's quite possible that Nero is Vergil's son, considering Vergil's presence can be trace nearly all over Devil May Cry 4, even if the character himself is currently MIA.